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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8c92e85f3d9deef03a1c880cacfbc768ca2297161499119d78d162607ce92ee' 
  AND token = '4jagBNe0vw7RtKH9+rbRySVSnZaq9SST5w42lYw+MMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}